Building-in machine press for books



Jan. 14,1964 ROBBINS ETAL BUILDING-IN MACHINE PRESS FOR BOOKS 7Sheets-Sheet 1 Filed Oct. 30, 1961 F I G. l

INVENTORS LEO ROBBINS JACK BENDROR BY Wow. OM)

ATTORNEYS L. ROBBINS ETAL BUILDING-IN MACHINE PRESS FOR BOOKS Jan. 14,1964 Filed Oct. 30. 1961 7 Sheets-Sheet 2 IN VENTO LEO ROBBINS JACKBENDROR Who-MLPQZZZMJ FIG. 2

ATTORNEYS Jan. 14, 1964 ROBBINS ETAL 0 BUILDING-IN MACHINE PRESS FORBOOKS Filed Oct. 50, 1961 7 Sheets-Sheet 3 A? LEO ROBBI s FIG, 3 BY JACKBENDROR WM+WM ATTOR NEYS Jan. 14, 1964 ROBBINS ETAL 3,117,330

BUILDING-IN MACHINE PRESS FOR BOOKS Filed Oct. 30, 1961 7 Sheets-Sheet 4FIG. 4

INVENTORS LEO ROBBINS JACK BENDROR W w-Pam ATTORNEYS FlG.6

Jan. 14, 1964 ROBBINS ETAL 3,117,330

BUILDING-IN MACHINE PRESS FOR BOOKS Filed Oct. 50, 1961 7 Sheets-Sheet 5Jim 1% F I G. 5 INVENTORS LEO ROBBINS B JACK BENDROR Wm m/ ATTORNEYS '7Sheets-Sheet 6 INVENTORS LEO ROBBINS JACK BENDROR I ATTORNEYS I WWH Jan.14, 1964 ROBBINS ETAL I BUILDING-IN MACHINE PRESS FOR BOOKS Filed Oct.30, 1961 F I G. 7

Jan. 14, 1964 Filed Oct. 30, 1961 L. ROBBINS ETAL 3,117,330

BUILDING-IN MACHINE PRESS FOR BOOKS 7 Sheets-Sheet 7 TIMER INVENTORS LEOROBBINS JACK BENDROR WM aZZna/M/ ATTORNEYS 3,117,335; BUILDW -E'NMACHENE FGR BfifiKS Leo Robbins, New York, and .laclr Bendror, Brochlyn,NIL, assignors to @versewing Machine Jenn pany of America, Medtord, acorporation of Massachusetts Filed Get. 3%, 19-57., Ser. No. 148,622; 12Claims. (Cl. ill-1) This invention relates in general to bookbindinmachines and more particularly concerns a new and improved combinationbook press and building-in machine.

in the manufacture of hard covered books, a number of page blocks, orfillers, are assemble-:1 in their proper order and joined along one edgeby stit hing or other means. The end sheets of the s wn book are thencoated with a layer of liquid adhesive by a casing-in machine, and theseparately formed hard outer cover is mounted in place. Subsequently,the book, and its cover, ar flattened and the adhesive set bytransierring the assembled book to a press where elevated temperaturesflashes the book within a short time. Simultaneously, creases may bepressed into cover adjacent the rounded end of the book and alongopposite sides thereof in order to form joints or hinge lines for thecover.

Although there are a number of power operated combination pressing andcreasing machines commercially available, none of them is particularlysatisfactory from the standpoint of operating convenience, flexibilityof control, wide utility and high productivity.

Accordingly, it is a object of the present invention to provideimprovements in combination book presses and building-in machines.

Another object of this invention is to provide a combination book pressand building-in machine which is capable of pressing a book under highpressure and simultaneously forming creases along opposite sides of thebook adjacent the rounded end.

Yet another object of this invention is to provide a comb r .tion bookpress and building-in machine in which a pair 0 platens and a pair ofseparately actuated creaseforming nipper jaws operate si" ultaneouslyunder pressure to press and build in the jo s of a book.

ion is to provide a combination boo. press and bui t :1 machine in whic"the jaw pressure may be readily adjusted to accommodate books of varioustl 'ckncsses.

A further object of this invention is to provide in a combination bookpress nd building-in is an proved t ale assembl' for manually Elli henippcr jaws with the joints on the book.

More particularly this invention features a combination book press andbuilding-in machine wherein independently actuated platens and nipperjaws function simultaneously to press a book form crease lines along thejoints. In a preferred embodiment of this invention, the pressureapplied by the platens to the book is constant whereas the pressureapplied by the per jaws may be varied as desi ed by manipula ion of ahydraulic c3 der of unique design. This invention also features a noveltoot treadle which is opcratively connected with one of the nipr" andcharacterized by extreme of operation short stroke of the treadieproducing a relatively large stroke of the jaw.

Still another feature of this invention relates to an iniproveclhydraulic system for operating the several parts of the machine.

But these and other features of the inveon, along with further objectsand advantages thereof, will become more fully apparent from thefollowing detailed descripthe combination of high pressure and.

lie States Patent 0 tion, with reference being made to the accompanyingdrawings in which:

FIG. 1 is a view in perspective of a combination book press andbuilding-in machine made according to the invention,

FIG. 2 is a front elevation of the machine with the front panels removedto show details of construction,

PEG. 3 is a rear elevation of the machine, also with the panels removed,

FIG. 4 is a top plan view of the machine,

FIG. 5 is a cross sectional view taken along the line 55 of FIG. 2,

FIG. 6 is a detail side view of the treadle assembly,

FIG. 7 is a sectional view of the nipper jaw hydraulic control assembly,

PEG. 8 is a plan view of the slide plate for the nipper jaw controlassembly,

a cross-sectional view taken along the line 7, and,

Referring now to the drawings, there is illustrated in FIG. 1 a doublestation combination book press and building-in machine in which a flatmoveable pressure plate "i0 is located on the upper portion of themachine adapted to reciprocate in unison with an independently moveableupper nipper jaw 12.

The plate 10 and the jaw 12 are in register respectively with a flat,fixed platen l4 and a lower nipper jaw 16 that may be adjusted to applyvarious pressures to the crease lines of a book that is placed in thebite of the nipper jaws.

As best shown in FIGS. 1, 2 and 5, the machine is constructed with arugged boxed frame including a base 18 having upright members Eli, andtop cross pieces 22. The tired platen lidis rigidly mounted horizontallyacross the tops of the cross pieces 22 and mo nted beneath the platen 14is a high pressure master hydraulic cylinder 24 having an annular pistonas integrated with a hollow slave piston 27 which engages a stout crossarm 2%. The cross arm carries at each end a pair of tension rods 39which pass vertically upward through the fixed platen 14 to engage themovcabie plate Reciprocation of the piston 27 serves to move the plateto to and away from the platen 1A and is capable of exerting a pressureof 18,860 lbs. or more against a book that is inserted between the plateand the platen.

fastened securely to the top of the plate it? is a pair of rectangularbars 32 With bearings inserted in their front ends. Vertically mountedin the front or the machne and passing through the bearings 33 are twocyline al tubular rods 36 that are fixed to the bracket 34 at theirupper and carry a horizontal cross bar 38 at their lower ends. Guidebearingsfle extend from opposite ends of the lower ipper jaw in andslidably engage the rods 36 to mainta n alignment between the jaws.

Mounted in fixed position by means of an angle piece and attached to thefront frame oi the machine is a web 4-2 winch supports a pair ofvertical rods 44 which, in turn, carry the lower nipper jaw 16 at theirupper ends and have their lower ends passing through the web 42..Compression springs are disposed over the lower portions of the rods4dand are held between locking nuts 48 at one end and by the web 42 atthe other end. Locking nuts limit the upward movement of the rod so thatthe normal upward position of rods and lower nipper jaw 1. 5 issubstantially as shown in HQ. 2. Smallcoil springs 49 are mountedbetween the bearings C13 and the bracket and exert a pressure which isequal to that of the springs 46. With this construction, the lowernipper j-aw 3 is yieldably supported by the frame and, by manipulationof a device now to be described, may be adjusted to vary the pressuremade by the bite of the nipper jaws.

It will be noted in FIGS. 2, 5 and '1' that an auxiliary hydrauliccylinder 52 is suspended vertically from the center of the lower nipperjaw 16 and aligns with a pad 54 mounted on the top center of the crossbar 33.

As shown in FIG. 9, the cylinder 5?. is formed with four longitudinalchambers 54 in each of which is mounted a piston 56 having reduced endportions 57. The actions of the pistons are determined by means of aslide 62 which is mounted for horizontal movement through the lower endof the cylinder 52. As best seen in FIG. 8, the slide 62 is arectangular, ilat metal plate having a series of detents 64 along oneside and a pair of parallel slots 66, 68 formed lengthwise through theslide. It will be observed that both slots, although of equal length,are wide at one portion and narrow at another with the slot 68 havingits wide portion somewhat shorter in lentgh than that of the slot 66,but having a longer section of narrow opening. With this arrangement,the number of the pistons 56 which will be in position to exert pressureon the nipper jaws may be selected by the operator. It will beunderstood that the wide portions of the slots are dimensioned to permitthe pistons 56 to pass through as suggested in FIG. 7 whereas the narrowportions will accommodate only the reduced ends 57 of the piston. In theleft hand piston, the shoulder, formed between the piston and itsreduced end 57, w ll bear against the top of the slide 2 and will remainin the upward position while the right hand piston will be able to movedown and with its lower end bearing against the pad 54, it will exertits force to press the nipper jaws towards each other.

The function of the auxiliary hydraulic cylinder 52 is to make availablea selection of pressures for operating the nipper jaws. The particularnipper jaw pressure required to form properl the joint of a book dependsupon the thickness of the book and certain other factors. It will beappreciated that if the pressure applied by the nipper jaws to thejoints of a book is excessive the joint will be damaged, whereas if thepressure is too low, the joint will not be properly formed. It istherefore desirable that the operator be able to adjust the nipper jawpressure in order to obtain optimum results.

Assuming that a book has been inserted between the plate and the platen14 with the joints lined up with the nipper jaws, upon actuation themaster cylinder 24 will cause its piston 26 together with its integratedslave piston 27 to telescope downwardly and bring the plate down againstthe book under a fixed pressure of about 18,000 lbs. Simultaneously theupper nipper jaw 12 will be moved by the plate 1% down against the jointof the book. However, since the lower nipper jaw is yieldably mounted tothe frame, the pressure applied to to the remaining portion of the bookand preferably will be in the order of 300 to 1500 lbs. for example.

The particular pressure that will be applied by the nipper jaws isdetermined by the number of acting pistons 56. Referring again to FIG.7, hydraulic fluid is admitted to the auxiliary cylinder through aninlet 76 at the top of the cylinder 52. Every piston which is able tomove downward and bear against the pad 57 will exert a definite pressureagainst the lower nipper jaw 16 and through the cross-bar 33, thevertical rods 36, and the bracket 34 to the opposing upper jaw. Itfollows that the more pistons are locked in the upward position, theless will be the pressure. In this mannert-he pressure applied to thejoints of a book is reduced and conversely the pressure may be increasedby moving the slide 62 to the left so that additional pistons 56 willexert their force.

For convenience in operating the slide 62, ahandle 74 .the book jointswill be considerably less than that applied is mounted at one end andextends out through an elon gated opening formed in a front panel '76.Extending also through the front panel are a pair of widely spacedstarter buttons 78 for switches 3t mounted on the web 42. By depressingboth switches simultaneously, the hydraulic system is actuated and theplate It recipro= cated. Since it is necessary that both buttons be depressed at the same time for the machine to cycle, there is no chancethat the operators hands he caught between the nipper jaws or thepressure plates. The starter bub tons are spaced sufficiently wide apartas to require; both of the operators hands to work them. Also, thesebuttons are located at a distance below the nipper jaws" and plates asto make it impossible for the operator tomove his hands from the buttonsto the jaws before they are closed. It will be appreciated that thissafety feature removes one of the major risks of injury to personnel.

Mounted on the side of the auxiliary cylinder 52 is a cutout switch 82having a spring loaded follower 84;- adapted to seat in whatever detent64 on the slide 62 is moved into register with it. The switch 82 servest'o prevent operation of the machine whenever the slide 62 is notproperly indexed in position. It will be understood that damage mightotherwise occur if the slide were part-' way between detent stops whenthe machine is cycled.

Referring now more particularly to FIG. ll), there is illustrated aschematic diagram of the hydraulic control system. This system includesa hydraulic pump driven by a motor 33 and taking suction on a sumpthrough a conduit 92 The pump 86 discharges through a conduit 96 to afour-way valve 9% controlled by a solenoid 1%. A timer lit-2 is mountedconveniently on top of the machine and controls automatically theoperation of the solenoid. From the valve 98 a conduit 104 connectsthrough a flow control valve with the upper portion or the mastercylinder while a conduit 196 comnects with the lower end of the samecylinder. It will be understood that the hollow slave 27 piston withinthe cylinder 24 will be extended or retracted according to the positionin which the solenoid has placed the four way valve 98. A conduit 103communicates with the annular space formed between the slave piston 27and an axial extension it so that the slave piston may be I6- tractedupon the delivery of fluid under pressure resulting from switching theposition of the four way valve 9 8-. A drain line 163 connects to thefour way valve to deliver the hydraulic discharge to the sump 98 fromthe line 19-iduring a retraction of the piston 27 and from the line 103during an extension thereof. As indicated previously, the auxiliarycylinder 52 is provided with an inlet 7% directly connected to theconduit 104 so that both the master and auxiliary cylinder operate simultaneously.

Referring more particularly to FIGS. 5 and 6, the treadle assembly willnow be described in detail. When a book is placed between the plate andplaten it is necessary to locate the book with respect to the nipperjaws so that when the machine is subsequently actuated the jaws willapply pressure exactly along the crease lines. To this end the uppernippetr jaw is mechanically supported by the trcadle assembly forindependent reciprocation with respect to the bracket 34, the plate 10and lower jaw 16 when the plate is in its normally open position.

The tubular rods 36 are formed with oppositely facing longitudinal slotslid at their upper portions to accom-- modate opposite ends of the uppernipper jaw 12. Mount-- ed for axial reciprocation within each of thetubular rods 36.? is a connecting rod 112. The upper ends of these rodsconnect with the ends of the upper nipper jaw- 12 while their lower endsare supported by the treadleassembly.

In F1676 it will be seen that the treadle assembly iiiclucles ahorizontal treadle 114 supported at its ends by lever arms 1'15 whichare pivotally mounted to the upright frame members 20 by pins 1P8. Thetreadle 114 is arranged parallel to a rounded lip 12!) which is fastenedalong the upper edge of the member 1 8 and serves as a rest for the heelof the opera-tors foot. The toe or sole of the operators foot willextend through a rather large opening 122-, formed in the lower front ofthe machine, and will bear comfortably on the treadle 114. Pivotablyconnected at the extremity of each lever arm 116 is a rod 124 which alsopivotably engages a rocker arm 12-6. The rocker arm 12a, in turn, isarranged to support at one end, by means of a swivel bushing 12%, thelower portion of the connecting rod 112. The other end of the rocker arm1-26 is supported by the link .139. The link 13% is suspended from anupright frame member by a pin 132, Each pair of arms 126 are rigidlyoormected together by tube 13:1.

Biasing this assembly to a normally upward position is an elongated coilspring 13 t which is fastened at its upper end to the frame of themachine and at its lower end to the rocker arm 26. Completing thetreadle assembly is a guide rod 136 which is pivoted to the frame member26 at one end and to the rocker arm 126 at its opposite end.

This unique treadle assembly because of its superior balanw, excellentmechanical advantage, and straight line motion requires only a verylight pressure against the treadle 114 to produce a rather long strokeof the upper uipper jaw 32.. it will be readily apparent both from FIG.6 and from the above description, that depressing of the treadle list bythe operators foot biases the rocker 12s against the spring 134, lettingdown the connecting rod 13 and thus closing the nipper jaws. The rod136, in cooperation with the link 13%, serves to guide the treadiemechanism in a fashion to produce a straight vertical movement. in otherwords, the pedal linkage system converts the arc motion of the treadl-e114- into a straight line motion of the bushing 128.

Because the treadle assembly only supports, and is not fastened to theventical rods 112, the operator can doress the treadle all the way,without exerting any additional pressure on the nipper jaw beyond itsweight.

in practice book presses of this type are provided with hGZh K'ZClpressing surfaces to accelerate the setting of the li ,uid ad esive thathas been between the cover and the outer leaves. Heating elements 338may be easily located wi tin th plate 3%, the plates and the two nipperjaws. Electi Wl leads for the movable upper jaw may be convenientlypassed through the connecting rod H2 if desired.

The machine illustrated and described herein is extremely versatile inop ration and is capable of accommodating both books and magazines in avariety of sizes and thicknesses. A run of ooks of mixed sizes may bereadily finished even by an unskilled operator. The operation of themachine is rapid with the joints being nipped simultaneously with thepressing of the book. The mechanism functions in a very smooth mannerand, since a very li ht pressure is required to depress treadle,operator gue is avoided.

While the inver n been described 'th particular reference to heillustrate embodiment, it i be understood that numerous mowcations willappear to those skilled in the art without departing from the scope ofthe invention.

Having thus described our invention, what we claim and desire to obtainby Letters Patent of the United States is:

l. A combination book press and building-in machine, comprising a frame,a fixed platen mounted on said frame, a pressure plan movably mounted onsaid frame in parallel register with said platen, master hydraulic meansfor moving said plate to and away irom said platen whereby said plate isadapted to apply pressure on a book placed between said plate and saidplaten, a first nipper jaw located adjacent a marginal edge of saidplaten, a second nipper jaw movably mounted in parallel register withsaid first nipper jaw, means connecting said second nipper jaw yieldablywith said plate whereby said nipper jaws close simultaneously with saidplate to nip the joints of said book, auxiliary hydraulic means operablein conjunction with saidmaster hydraulic means for furnishing hydraulicforceto said first jaw and applied against said second jawsimultaneously with the application of pressure on said book by saidplate and means independently of said master hydraulic means for varyingthe effective force applied to said second jaw.

2.. A combination book press and building-in machine, comprising aframe, a fixed platen mounted on said frame, a pressure plate movablymounted on said frame in parallel register with said platen, masterhydraulic means for moving said plate to and away from said platenwhereby said plate is adapted to apply pressure on a book placed betweensaid plate "and said platen, a first nipper jaw located adjacent amarginal edge of said platen and yieldably mounted to said frame, asecond nipp es jaw movably mounted in parallel register wtih said firstnipper jaw, means connecting said second nipper jaw yieldably with saidplate whereby said nipper jaws close simultaneously with said plate tonip the joints of said book, auxi-l-imy hydraulic means operable inconjunction with said master hydraulic means for furnishing hydraulicforce to said first jaw against said second jaw simultaneously with theapplication of pressure on said plate by said master hydraulic means, aplurality of selectively operable pressure transmitting pistons, meansfor varying the effective force pplied to said first jaw and treadlemeans for moving said second jaw independently of said plate when saidplate is in an open position.

3. A combination book press and building-in machine, comprising a frame,a fixed platen mounted on said frame, a pressure plate movably mountedon said frame in parallel register with said platen, master hydraulicmeans for moving said plate to and away from said platen whe eby saidplate is adapted to apply pressure on a book placed between said plateand said platen, a first nipper jaw located adjacent a marginal edge ofsaid platen and yieldably mounted to said frame, a second nipper jawmovably mounted in parallel register with said first nipper jaw, meansconnecting said second nipper jaw yieldably with said plate whereby saidnipper jaws close simultaneously with said plate to nip the joints ofsaid book, auxiliary hydraulic means operable simultaneously inconjunction with said master hydraulic means for furnishing hydraulicforce to said first jaw and against said second jaw, an array of axiallymovable pistons associated with said auxiliary hydraulic means, each ofsaid pistons being adapted to apply a portion of the total forceavailable to said first jaw and against said second jaw and means forselectively actuating said pistons.

4. A combination book press and building-in machine, comprising a frame,a fixed platen mounted on said frame, a pressure plate movably mountedon said frame in parallel register with said platen, master hydraulicmeans for moving said plate to and away from said platen whereby saidplate is adapted to apply a heavy pressure on a book placed between saidplate and said platen, a first nipper jaw located adjacent a marginaledge of said platen and yieldably mounted to said frame, a second nipperjaw mounted in parallel register with said first nipper jaw, meansconnecting said second nipper jaw yieldably with said plate whereby saidsecond nipper jaw is adapted to close simultaneously with said plate tonip the joints of said book, auxiliary hydraulic means interposedbetween said first jaw and said second jaw and operable simultaneouslywith said master hydraulic means for furnishing hydraulic force to saidfirst jaw against said second jaw, manually adjustable jaw connectingpiston means for varying the eifective force transmitted to said jawsand treadle means for moving said second jaw independently of saidplate.

5. A hydraulic device for use in a building-in machine having first andsecond nipper jaws mounted for relative movement to and away from eachother, comprising a cylinder mounted on said first jaw, a plurality ofpistons slidably mounted Within said cylinder, means for selectivelylocking certain ones of said pistons in an inoperative position, meansfor delivering a flow of hydraulic fluid under pressure into saidcylinder, tension members connected to said second jaw and extendinginto line with said piston whereby one or more of said pistons may bearagainst said tension means to apply a selected nipping pressure to saidjaws.

6. A hydraulic device according to claim 5 wherein said means forselectively locking certain ones of said pistons includes a plateslidably mounted in said cylinder, said plate being formed with openingsdimensioned to permit the passage of a piston when aligned therewith.

7. A hydraulic device according to claim 6 including detent stops formedin said plate and follower means for properly positioning said slide.

8. A device for applying a selected pressure between a pair ofabutments, comprising a cylinder mounted to one of said abutments, aplurality of pistons slidably mounted within said cylinder, means forselectively locking certain ones of said pistons in an inoperativecondition, means for delivering a flow of fluid under pressure into saidcylinder, means connecting one or more of said pistons with the other ofsaid abutments whereby said pistons may apply pressure between saidabutments, the effective pressure applied between said abutments beingrelated to the number of pistons in operative condition.

9. Apparatus for exerting pressure against an abutment, comprising asupport, a tubular easing mounted to said support, said casing beingclosed at one end, a plurality of pistons slidably mounted at theopposite end of said casing and adapted for limited axial reciprocationin and out of said casing, said piston being adapted to drivingly engagesaid abutment when extending outwardly of said casing, means connectingsaid casing to a source of pressurized fluid for urging said pistonsinto axially extended positions and means for locking selected ones ofsaid pistons within said casing, whereby the pressure applied to saidabutment may be selectively varied.

10. Apparatus according to claim 9 wherein said locking means includesan apertured plate slidably connected to said casing.

11. A treadle mechanism for operating a nipper jaw in a building-inmachine, including a frame, an elongated first nipper jaw mountedhorizontally on said frame, an elongated second nipper jaw mountedparallel to and vertically above said first nipper jaw and movable toand away from said first jaw, at least one vertically disposed roddepending from said second jaw, a rocker arm having its forward endpivotally engaging the lower end of said rod and extending rearwardlytherefrom, a link pivotally engaging the rearward end of said rocker armat one end and said frame at the other end, a spring connecting saidrocker arm to said frame and normally urging said arm and said rod in araised position, a guide rod pivotally engaging at its rearward end themid-portion of said rocker arm and said frame at its forward end, a tierod pivotally engaging at its upper end the mid-portion of said rockerarm and depending therefrom, a lever arm disposed generally parallel tosaid guide rod and pivotally engaging at its rearward end the lower endof said tie rod and said frame at its forward end at a point spacedbelow the frame pivot point of said guide rod and a treadle rigidlymounted to the mid-portion of said lever arm whereby pivotal movement ofsaid treadle will cause linear movement of said nipper jaw rod.

12. A treadle mechanism for operating a nipper jaw in a building-inmachine, including a frame, a first nipper jaw mounted in horizontalposition on said frame, a second nipper jaw mounted vertically abovesaid nipper jaw and movable to and away from said first nipper jaw,vertically disposed rods freely supporting said second jaw, lever meanspivoted to said frame and engaging said rods, spring means connectingsaid frame and said lever means for supporting said second jaw in anormally upward position and a treadle operatively connecting said rodsfor depressing said rods to permit said second nipper jaw to drop freelytowards said first nipper jaw.

References fired in the file of this patent UNITED STATES PATENTS603,406 McClellan May 3, 1898 2,636,195 Hicks et al. Apr. 28, 19532,893,023 Crawley et a1. July 7, 1959 2,969,554 McCahon Ian. 31, 19613,016,550 Schramm Jan. 16, 1962

1. A COMBINATION BOOK PRESS AND BUILDING-IN MACHINE, COMPRISING A FRAME,A FIXED PLATEN MOUNTED ON SAID FRAME, A PRESSURE PLATE MOVABLY MOUNTEDON SAID FRAME IN PARALLEL REGISTER WITH SAID PLATEN, MASTER HYDRAULICMEANS FOR MOVING SAID PLATE TO AND AWAY FROM SAID PLATEN WHEREBY SAIDPLATE IS ADAPTED TO APPLY PRESSURE ON A BOOK PLACED BETWEEN SAID PLATEAND SAID PLATEN, A FIRST NIPPER JAW LOCATED ADJACENT A MARGINAL EDGE OFSAID PLATEN, A SECOND NIPPER JAW MOVABLY MOUNTED IN PARALLEL REGISTERWITH SAID FIRST NIPPER JAW, MEANS CONNECTING SAID SECOND NIPPER JAWYIELDABLY WITH SAID PLATE WHEREBY SAID NIPPER JAWS CLOSE SIMULTANEOUSLYWITH SAID PLATE TO NIP THE JOINTS OF SAID BOOK, AUXILIARY HYDRAULICMEANS OPERABLE IN CONJUNCTION WITH SAID MASTER HYDRAULIC MEANS FORFURNISHING HYDRAULIC FORCE TO SAID FIRST JAW AND APPLIED AGAINST SAIDSECOND JAW SIMULTANEOUSLY WITH THE APPLICATION OF PRESSURE ON SAID BOOKBY SAID PLATE AND MEANS INDEPENDENTLY OF SAID MASTER HYDRAULIC MEANS FORVARYING THE EFFECTIVE FORCE APPLIED TO SAID SECOND JAW.